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A 26-year-old member asked:

My husband got stung by a prickly cattapillar and it's swollen should we be concerned?

2 doctor answers8 doctors weighed in
Dr. David Miller
Dr. David Milleranswered
Family Medicine 11 years experience
Probably not: Most of those catepillars are not dangerous. Their spines contain chemical irritants to discourage predators from eating them. The important thing is to watch for signs of infection like warmth, redness and an inrease in pain. You can also try some ice or a poultace of baking soda in water to help "draw out" the irritant.
Dr. David Miller
Dr. David Miller commented
Family Medicine 11 years experience
Provided original answer
You're welcome!
Apr 25, 2012
Dr. Stephen Lorino
Internal Medicine 27 years experience
Histamine release: A sting or bite typically causes release of histamine causing redness, swelling, itching, etc. Usually can control with cool compress, Benadryl (diphenhydramine) or claritin. If it causes shortness of breath, wheezing or lips to swell, seek attention. Thx.

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